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Question 20214
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: RMS Voltage Calculation MCQ

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RMS Voltage CalculationMediumQuestion 20214

Question

An AC generator produces peak voltage 311 V. Its RMS voltage is approximately:
  1. A
    311 V
  2. B
    220 V
    Correct
  3. C
    440 V
  4. D
    156 V

Correct answer

220 V

Explanation

V_rms = V₀/√2 = 311/1.414 ≈ 220 V. This is why household AC is called '220 V' — 220 V RMS corresponds to 311 V peak.

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